KR-102961525-B1 - Light path control member, and display device including same

Abstract

A light path control member according to one embodiment includes: a first substrate; a first electrode disposed on the first substrate; a first light conversion unit disposed on the first electrode; a second substrate disposed on the first light conversion unit; a second electrode comprising a second-1 electrode disposed between the second substrate and the first light conversion unit and extended along a first direction, and a second-2 electrode extended along a second direction intersecting the first direction; and a third electrode disposed on the upper surface of the second substrate.

Inventors

• 이상현
• 윤혁준
• 이용석
• 박민수

Assignees

• 엘지디스플레이 주식회사

Dates

Publication Date

20260507

Application Date

20221124

Claims (20)

1. First substrate; A first electrode disposed on the first substrate; A first light conversion unit disposed on the first electrode; A second substrate disposed on the first light conversion unit; A second electrode comprising a second-1 electrode extended along a first direction and disposed between the second substrate and the first light conversion unit, and a second-2 electrode extended along a second direction intersecting the first direction; and It includes a third electrode disposed on the upper surface of the second substrate, and The above-mentioned second-1 electrodes are provided in plurality, and the plurality of second-1 electrodes are spaced apart from each other in the second direction. The above-mentioned second-2 electrodes are provided in a plurality, and the plurality of second-2 electrodes are spaced apart from each other in the first direction.
2. In Article 1, The first light conversion part comprises a light transmission part and a light path control member including a light path variable part around the light transmission part.
3. In Article 2, The above optical path variable member is an optical path control member that changes the path of light provided according to the application of voltage.
4. In Article 2, The above optical path variable part is an optical path control member comprising a dispersion and light-absorbing particles within the dispersion.
5. In Paragraph 4, The optical path variable part comprises a first optical path variable part extended along the first direction and a second optical path variable part extended along the second direction, forming an optical path control member.
6. In Article 5, An optical path control member in which the first optical path variable part overlaps with the 2-1 electrode and the second optical path variable part overlaps with the 2-2 electrode.
7. In Article 6, The above third electrode comprises a third-1 electrode extended along the first direction and a third-2 electrode extended along the second direction, wherein the third-1 electrode overlaps the first optical path variable portion and the third-2 electrode overlaps the second optical path variable portion, forming an optical path control member.
8. In Article 7, An optical path control member wherein the 2-1 electrode extends along the 1st direction and the 2-2 electrode extends along the 2nd direction, each extending in a zigzag shape.
9. In Article 7, The above-mentioned second-1 electrode is extended along the first direction in a zigzag shape, and the above-mentioned second-2 electrode is provided in a plurality of such electrodes, and the plurality of second-2 electrodes are each connected to the other end of the second direction of the second-1 electrode and to one end of the second direction of the second-1 electrode, wherein the second-2 electrode connected to the other end of the second direction of the second-1 electrode and the second-2 electrode connected to one end of the second direction of the second-1 electrode are alternately arranged along the first direction, forming an optical path control member.
10. In Paragraph 4, In the first mode, the light-absorbing particles are a light path control member disposed adjacent to the second electrode.
11. In Article 10, An optical path control member in which, in the first mode, a (+) voltage is applied to the second electrode and a (-) voltage is applied to the first electrode.
12. In Article 10, In the second mode, the light-absorbing particles are a light path control member disposed adjacent to the first electrode.
13. In Article 12, An optical path control member in which, in the second mode, a (-) voltage is applied to the second electrode and a (+) voltage is applied to the first electrode.
14. In Article 12, A light path control member in which, in a third mode, the light-absorbing particles are disposed adjacent to the first electrode, and in the third mode, no voltage is applied to each of the first electrode and the second electrode.
15. In Article 12, In the third mode, the light-absorbing particles are light path control members dispersed within the dispersion.
16. In Article 2, The optical path control member is provided with a plurality of optical path variable members, and the optical path transmitting member is disposed between adjacent optical path variable members on a plane.
17. In Article 1, An optical path control member having a thickness of 30 µm to 50 µm for the third electrode.
18. In Article 1, An optical path control member in which the thickness of the second electrode is smaller than the thickness of the third electrode.
19. In Article 1, The above third electrode is a planar optical path control member.
20. In Article 1, A light path control member further comprising a second light conversion unit on the third electrode, a third substrate on the second light conversion unit, and a fourth electrode between the second light conversion unit and the third substrate.

Description

Light path control member, and display device including same The present invention relates to an optical path control member and a display device including the same. Light-blocking films block the transmission of light from a light source and are attached to the front of display panels, which are display devices used in mobile phones, laptops, tablet PCs, in-car navigation systems, and automotive touch screens. They are used to adjust the viewing angle of light according to the angle of incidence when the display emits an image, thereby enabling the user to see clear image quality at the required viewing angle. In addition, light-blocking films can be used on vehicle or building windows to partially block external light to prevent glare or to prevent visibility from the outside to the inside. That is, the light-blocking film may be a light path conversion member that controls the path of light to block light in a specific direction and transmit light in a specific direction. Accordingly, the light transmission angle can be controlled by the light-blocking film, thereby controlling the user's viewing angle. FIG. 1 is a plan view of a second electrode and a third electrode according to one embodiment. FIG. 2 is a perspective view of an optical path control member according to one embodiment. Figure 3 is a cross-sectional view taken along the line AA' of Figure 1. Figure 4 is a cross-sectional view taken along the BB' line of Figure 1. FIG. 5 is a cross-sectional view showing the second and third modes of the optical path control member of FIG. 1. Figure 6 is a schematic diagram showing the optical path in the first mode. Figure 7 is a schematic diagram showing the optical path in the second and third modes. Figure 8 is a graph showing the angle of incidence of light (S-polarized light) incident from the light-transmitting part to the optical path variable part and the reflectance due to the difference in refractive index between the light-transmitting part and the optical path variable part. Figure 9 is a graph showing the angle of incidence of light (P-polarized light) incident from the light-transmitting part to the optical path variable part and the reflectance due to the difference in refractive index between the light-transmitting part and the optical path variable part. FIGS. 10(a) and FIGS. 10(b) are drawings showing the frontal transmittance in the second mode and the first mode, respectively. FIG. 11 is a perspective view of a display device according to one embodiment. Fig. 12 is a cross-sectional view of Fig. 11. FIG. 13 is a cross-sectional view of a light path control member in a first mode according to another embodiment. FIG. 14 is a cross-sectional view of the optical path control member according to FIG. 13 in the second mode. FIG. 15 is a cross-sectional view of the optical path control member according to FIG. 13 in the third mode. FIG. 16 is a cross-sectional view of an optical path control member according to another embodiment. FIG. 17 is a cross-sectional view of an optical path control member according to another embodiment. FIG. 18 is a cross-sectional view of an optical path control member according to another embodiment. FIG. 19 is a plan view of the second electrode and the third electrode according to another embodiment. FIG. 20 is a plan view of the second electrode and the third electrode according to another embodiment. FIG. 21 is a plan view of the second electrode and the fourth electrode according to another embodiment. FIG. 22 is a perspective view of an optical path control member according to another embodiment. Figure 23 is a cross-sectional view taken along the CC' line of Figure 21. FIG. 24 is a cross-sectional view showing the second and third modes of the optical path control member of FIG. 23. FIG. 25 is a plan view of the second electrode and the fourth electrode according to another embodiment. The advantages and features of the present invention and the methods for achieving them will become clear by referring to the embodiments described below in detail together with the accompanying drawings. However, the present invention is not limited to the embodiments disclosed below but may be implemented in various different forms. These embodiments are provided merely to ensure that the disclosure of the present invention is complete and to fully inform those skilled in the art of the scope of the invention, and the present invention is defined only by the scope of the claims. When elements or layers are referred to as being "on" another element or layer, this includes cases where another layer or element is interposed directly on or in the middle of another element. Throughout the specification, the same reference numerals refer to the same components. Shapes, sizes, ratios, angles, numbers, etc., disclosed in the drawings for describing embodiments are exemplary and therefore the invention is not limited to the depicted details. Although terms such as "first," "second